<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="/0505/js/jq.js"></script>
</head>
<body>
    <button class="btn1">数据</button>
    <script>
        let xhr = (url)=>{
            return new Promise((resolve, reject) => {
                $.ajax({
                    url,
                    success(res) {
                        resolve(res)
                    },
                    error(err) {
                        reject(err)
                    }
                })
            })
        }

        $('.btn1').click(async function() {
            let res1 = await xhr('http://localhost:3000/play/category');
            let res2 = await xhr('http://localhost:3000/play/xxxx');
            console.log(res1, res2);
        })
        
    </script>
</body>
</html>